I build these little ESP32 relay boards, but the ESP32 will not flash, it just gets stuck at erasing.
I’ve tried different USB cables, multiple ESP32’s, nothing wants to work.
Any ideas?
Thanks
Flash the ESP before you connect to the module.
But then im stuck for any future updates etc.
What GPIO pins are you using to drive the optocouplers of the relay board? Some may not be suitable for switching and may cause the board not to boot.
Yea I just worked out that GPIO 12 needs to be low on boot. Have removed it and added to a different GPIO and flash has been successful.
Bit of a pain! Would be nice if all the pins lined up and were usable 
Thanks guys!